package collection;

import java.util.Collection;
import java.util.HashSet;

public class CollectionDemo2 {
    public static void main(String[] args) {
        //Collection c = new ArrayList();
        Collection c=new HashSet();
        c.add(new Point(1,2));
        c.add(new Point(3,4));
        c.add(new Point(5,6));
        c.add(new Point(7,8));

        boolean d =c.add(new Point(3,4));

        System.out.println(d);
        System.out.println(c);

        Point e = new Point(1,2);
        boolean contains = c.contains(e);
        System.out.println(contains);
        boolean remove = c.remove(e);
        System.out.println(c);
    }
}
